By Fernando Pacheco Torgal, J. A. Labrincha, M. V. Diamanti, C.-P. Yu, H. K. Lee (eds.)
Putting ahead an leading edge method of fixing present technological difficulties confronted via human society, this booklet contains a holistic method of perceiving the opportunity of normal platforms. Nature has constructed a number of fabrics and strategies which either keep an optimum functionality and also are absolutely biodegradable, houses which might be utilized in civil engineering.
Delivering the most recent examine findings to development execs and different practitioners, in addition to containing details priceless to the general public, ‘Biotechnologies and Biomimetics for Civil Engineering’ serves as a major device to take on the demanding situations of a extra sustainable development and the way forward for buildings.
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Extra info for Biotechnologies and Biomimetics for Civil Engineering
2012; Pacheco-Torgal and Jalali, 2013), eco-efficient biocement can be produced using mining tails/residuals of limestone, dolomite, iron ore and organic agricultural, food-processing, or municipal wastes using acidogenic fermentation and bioreduction of iron with production of dissolved salts of calcium, magnesium, and iron. The problem with the brittleness of biocementation could be solved using biomimetic approach (Sarikaya 1994; Mayer and Sarikaya 2002) using composite strengthening through combination of mineral and organic nano- and micro-particles.
1 Calcium- and Urea-Dependent Biocementation Most popular type of biocementation is based on so-called microbially-induced calcium carbonate precipitation (MICCP), which is formation of calcium carbonate minerals such as calcite, vaterite, or aragonite on the surface of soil particles due to: (1) adhesion of cells of urease-producing bacteria (UPB) on the surface of particle; (2) creating a microgradient of concentration of carbonate and pH in the site of cell attachment due to hydrolysis of urea by urease of UPB.
Probably, high strength but at the same time high permeability of sand after magnesium-based biocementation is due to coating of whole surface of sand grains with crystals, while calcium- and urea-based biocementation produced crystal mainly in the contact areas of the sand grains (Fig. 7). Combined calcite and struvite (NH4MgPO4) precipitation using triple superphosphate and magnesium salt to avoid formation of soluble ammonia and release of ammonia to atmosphere during biocementation: CaðH2 PO4 Þ2 þ 2 Mg2þ þ COðNH2 Þ2 þ H2 O þ acid urease !
Biotechnologies and Biomimetics for Civil Engineering by Fernando Pacheco Torgal, J. A. Labrincha, M. V. Diamanti, C.-P. Yu, H. K. Lee (eds.)